Rollable Display Afterimage Reduction via Weighted Pixel Control
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Solution Overview
Problem
Rollable displays experience afterimages at the boundary between exposed and rolled-in display areas due to differences in pixel values and gate-source voltages, leading to visual artifacts and reduced user experience.
Innovation Solution
An electronic device with a rollable display applies different weights to pixel values in adjacent horizontal lines based on their distance from the boundary, generating a second image for the rolled-in area to match the first image in the exposed area, thereby minimizing afterimage formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the same image is displayed continuously in the exposed display area, then the image display is stable and clear, but an afterimage occurs at the boundary between the exposed and rolled-in display areas
Solution Approach 1:
The system performs preliminary action by displaying a second image in the rolled-in display area before the user can see it, preparing the pixel values and gate-source voltages in advance. This preliminary display prevents afterimage formation when the rolled-in area is later exposed, as the pixels are already in a state that matches the first image content, eliminating the need for corrective compensation when the areas transition.
2Object-generated harmful factors
If different images are displayed in the exposed and rolled-in display areas to prevent afterimage, then afterimage is reduced, but the device complexity increases due to image processing requirements
Solution Approach 1:
The system applies local quality by displaying different images in different display areas based on their specific conditions. The first image is displayed in the exposed area where visual quality is critical, while the second image (which may be blurred, inverted, or different content) is displayed in the rolled-in area where it won't be seen. This localized approach prevents afterimage without requiring complex real-time processing of the entire display.
Data Source
AI summary
An electronic device is provided. The electronic device includes a housing, a display rollable into the housing, and a display driver circuitry operably coupled to the display. The display driver circuitry is configured to display, while the electronic device is in a first state in which a first display area of the display is exposed and a second display area of the display adjacent to the first display area is rolled into the housing, a first image in the exposed first display area, obtain, a second image based on applying a first weight to a pixel value of a first pixel of a first horizontal line and applying a second weight less than the first weight to a pixel value of a second pixel of the first horizontal line, and display, while displaying the first image, the second image in the second display area rolled into the housing.